my 3rd display won't connect

[quattro]

Hello, i just bought my self a third monitor, i have one BenQ XL2720Z and 2 BenQ RL2455HM. I've always used 2 monitors but i decided to go for 3 monitors because my graphics card can handle it, and i like it to game on 3 displays. My graphics card is the AMD Radeon R9-255/2G with a DVI, DP & HDMI port i bought a DP to HDMI cable and put that one in my main monitor the BenQ XL2720Z. I use the DVI to DVI and HDMI to HDMI on my other 2 BenQ RL2455HM Monitors but one can connect while the other goes stand bye. What can i do!? i alrady re installed all my drivers etc. and in Eyefinity my 3rd display wont show up either. sorry for my bad english..

[Haldi]

Are you certain your card supports 3 Monitors?
Did you try contacting the Support from your Graphicscard producer and ask them?

[quattro]

Are you certain your card supports 3 Monitors?
Did you try contacting the Support from your Graphicscard producer and ask them?

yes i did my R9 255 AMD card does support up to 3 screens.. Will it help if i buy a active display port? I have a dp to dvi cable atm will that solve my problem?
thanks for reply anyway!

[Haldi]

it *should* solve it.
You might want to buy it with a retailer that allows to send back non working products just in case it doesnt help.